[LLVMdev] clang's lazy line number detection

[deadal nix]

I was wondering, looking into clang, it seems that line number are computed
lazily, instead of during lexing and stored in Locations as it is often
done.

The benefit seems obvious: Location can be smaller and they are all over
the place, it is a win. But at the same time, it forces the compiler to go
over the file twice, and the file is probably gone from the cache by the
time you request a line number (or is it ?).

Anyway, I was wondering why this design decision, if benchmark were done at
the time or if there are reason I didn't understood.

Thanks in advance for your answers.
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